Can't Boot From CDRom

Im trying to set up windows XP on another computer I have here and when I put the XP cd in the cd rom and wait for it to get to the part where its loading from cd and you press any key, this error comes up

CDBOOT : Error booting from cdrom drive CODE : 5

Or something simmilar anyways (might not be exact)
What can I do about this? Any help would be great! Thanks